In a recent post I configured the SDRangel “Simple PTT” plugin. While testing I’ve noticed that there is some TX leakage from the ADLAM Pluto, which I measure to be -50dB-ish below its nominal output.

In the gallery below the ADLAM Pluto was set to transmit 0dBm (1mW) and on the right is the leakage when in receive.

I may have to investigate if the “samplesink/plutosdroutput” plugin within SDRangel can be configured to turn the TX chain completely OFF and what impact this may have.

The output level seems to jump when the transmit frequency is adjusted 100kHz away from the receive, and here I suspect that the DC correction within the receiver is doing double time removing the TX leakage. I will just have to keep an eye on this when integrating with the Charon.

However that will have to wait for a later post.